How to price outside processing without guessing
The estimator has priced everything they control, and 2 lines are still empty. Carbonitride and zinc nickel, both leaving the building, both needing a supplier’s number that has not arrived.
The quote is due, so a figure gets carried from memory, the price plating cost the last time anyone checked, and the quote goes out with 2 guesses inside it wearing the same font as the facts.
Every floor does this, and on outside processing lines it is the single most common place a healthy-looking quote leaks.
Why the provisional number rots
The scale of the exposure is easy to underestimate, because outside lines look small individually. On the worked spool valve, carbonitride and zinc nickel together carry $0.200 of a $1.014 unit cost, a fifth of the part, committed for 6 years, on the say-so of numbers you did not set and may not have checked.
No estimator would carry a fifth of the part’s machining on a 2 year old memory. The outside fifth gets exactly that treatment, routinely, because the supplier’s price feels like the supplier’s problem right up until the program is awarded, at which point it becomes yours.
A carried number is a photograph of an old market. Plating and heat treat prices move with chemistry costs, energy and the supplier’s own load, and they move without notice.
The estimate that carries last year’s number is not neutral, it is optimistic, because suppliers announce increases and absorb decreases, so the drift runs one way.
On the worked spool valve this site prices everywhere, the provisional lines went in at $0.128 and $0.105, and the firm quotes came back at $0.110 and $0.090.
The drift can run in your favor. The point is that until the quote arrives, you do not know, and you have signed a price that assumes you do.
A carried number is a guess.
The deeper rot is what the provisional number leaves out. A per-pound price remembered from an old invoice contains no freight, no handling at either dock, no certification paperwork, and none of the lot arithmetic below.
The supplier’s real quote contains all of it, which is why the 2 numbers disagree even when the base process price has not moved.
The minimum lot trap
Processors price by the lot, the load, the barrel, the furnace charge, and below a threshold quantity you pay the lot charge regardless.
A part that plates for cents a piece at 50,000 pieces can cost 10 times that per piece on a 500 piece trial run, because the barrel does not care how full it is.
Quotes get burned here at both ends. A trial order priced from the production rate loses money on every piece, and a production quote priced from a trial invoice loses the job.
The defence is to price the lot rather than the piece. Ask the processor for the lot charge, the full-load price and the threshold quantity, then let the release schedule decide which one each order actually pays.
A supplier quote that only gives you a per-piece figure has already done that arithmetic on an assumption you cannot see, and when the customer’s release pattern differs from the assumption, the difference is yours.
On program work with a trial phase, quote the phases separately and say so, because a buyer respects a price that changes for a stated reason far more than one that quietly averaged the pain.
The barrel bills you anyway.
Freight, handling and the second truck
Outside lines carry logistics that the process price never mentions. Every outside operation is 2 truck moves, out and back, plus a packaging decision, because a honed bore that leaves in a gaylord comes back with dings that a layer-packed tote would have prevented, and the scrap belongs to whoever chose the packaging.
Add receiving, count verification and certification filing at your dock, minutes per lot that become real hours at weekly releases across a 6 year program. None of this is exotic.
All of it is absent from a remembered per-pound number, and together it routinely moves an outside line by more than the process price moves between suppliers, which is why the freight column deserves the same discipline as the process column.
Source approval, the schedule trap
On program work the buyer often reserves the right to approve who touches the part, and the reservation is buried in the quality documents rather than announced.
Price the plate line against your cheapest plater, win the job, and then discover the customer’s approved source list contains a different plater at a different price, and you own the difference for the program.
The check costs one read of the package. The miss costs margin, or a PPAP resubmission when the source changes, or both, and it is one of the 3 recurring traps flagged in how to read an RFQ package.
The same read should capture certification requirements, because a plate line with full traceability and certs is a different product from the same chemistry without them, and the supplier will price them differently too.
Certs per lot, plating thickness reports, bake records for hydrogen embrittlement relief, each is paperwork someone prepares and files, and on weekly releases the paperwork is a standing cost.
Ask before you price.
The estimator’s question for every outside line is the same, what exactly must travel with the parts, in both directions, and the answer lives in the quality documents rather than on the print.
Approval cuts the other way too, and the second direction is leverage.
Once your plater is on the customer’s approved list, switching costs protect the relationship, and once you are the supplier whose outside chain is already approved, you are cheaper to award the next part in the family than any competitor who would have to qualify theirs.
Outside processing looks like a cost center on the quote. Managed deliberately, the approved chain is a moat, which is a reason to choose processors expecting a long relationship rather than re-shopping every quote for cents.
Capacity and the single source
The price is only half the exposure. A processor who quotes attractively and runs 3 furnaces at full load has sold you a number without capacity behind it, and on program work with weekly releases that becomes your delivery problem within a quarter.
Ask what volume they are quoting against, what their current load looks like, and what happens to your lot when a larger customer’s order arrives the same week. The answers vary usefully between suppliers who want the work and suppliers who are already full.
Single-sourcing an outside process is the related risk. One approved plater is efficient until the week they have a line down, and the buyer who approved only that plater will still expect parts.
Where the program justifies it, get a second processor through source approval early, while nothing is urgent, because qualifying a supplier during a crisis costs whatever it costs. That work belongs in the quote phase, since it is cheapest to raise while the customer is still choosing you.
An approved chain is a moat.
Getting the quotes in before the price goes out
The fix is procedural rather than clever, run the supplier RFQs in parallel with your own estimate instead of after it.
The day the package arrives, the outside operations are identifiable from the print and the routing sketch, which means supplier requests can leave the building the same morning, with the drawing, the quantities, the release schedule and the spec attached.
Suppliers answering a clean request with real quantities respond in days, often faster than your own estimate finishes, and the quote that goes out carries firm numbers where it matters most.
Where a firm number genuinely cannot arrive in time, carry the provisional line honestly. Mark it as provisional inside your own record, price it from the most recent comparable job rather than the oldest memory, pad it toward the direction the market drifts, and diary the firm quote’s arrival against the award.
A provisional line you are tracking is an estimate. A provisional line dressed as a fact is how the margin on the whole quote quietly becomes a donation, and it is one of the fit questions worth pressing in the buyer’s guide, because a quoting system that cannot tell the 2 apart is not modelling how outside work actually behaves.
The longer fix is to treat your 3 or 4 regular processors the way you treat your own work centers, as known quantities with a record.
Keep their quotes in one place with dates on them, so the estimator reaching for a plating number reaches for the most recent real figure on the most similar part, with its lot terms and freight visible, instead of whatever invoice memory serves up.
A year of that habit produces its own small history, and the same compounding that sharpens inside pricing starts working on the lines you do not control.
It also changes the supplier conversation, because a processor who knows their numbers are kept, compared and re-asked prices you like a partner with a memory rather than a caller with a deadline.